Grab-bucket.



.PATENTED AUG. 25, 190s.

H. P. ANDRESEN.

GRAB BUCKLT.`

APPLICATION FILED OCT. 16, 1907.

2 SHEETS-SHEET l. ,21. I la. .E M f PATENTED AUG. 25, 1908.

H. P. ANDRBSEN APPL ATION 'FILED 0UT.1G. 1907.

2 SHEETS-SHEET Z.

nnrrnn ernstes rnd-entr ernten.

HERMAN I?. ANDRESEN, OF CHICAGO, ILLINOIS, ASSIGNOR OF vONE-HALF TO DAVID J. EVANS, OF CHICAGO, ILLINOIS.

GRAB-BUCKET.

Specification of Letters Patent.

Patented Aug. 25, 1968.

Application filed October 16, 190'?. Serial No. 397,715.1.

'To all 'whom 'it may concern:

Be it known that I, HERMAN I. Annnnsnn,

e citizen oi' the United Stetesyend a. resident of Chicago, Cook county, Illinois, have 1n-- vented certem new end useful Im rovements in Grab-Buckets, of which the to lowingis e. full, cleer, and exsctdescription, such as will enable others skilled in the srt to Whichzit ep.

` the like.

ving upwardly therefrom.

The specisl objects of the invention ere-to provide e powerful, wide opening grab )ucket that shell be strong and durable; which shell have maximum closing end digging power, and, which shall be provided with positive and effective opening means comprising e. minimum number of erts.

A further ond special object oi the invention is to improve or modify the construction oi' grab buckets of the type disclosed'in Letters Potent N o. 870,S12, grantedv to me November 12, 1907.

My invention consists generally. in s. greb bucket com rising s frame which carries the closing mec ienism of the bucket, in com-bination with bucket members or scoops hav ing their upper ends pivoted upon said treme, a toggle device having its ends pivoted upon seid scoops, c stirrup et the knee ot' the toggle and en .operating cable or cables extend The invention also consists in various ferturcs 'oi construction ond in combinations of parts, all as hereinafter described and particularly pointed out in the claims.

The invention will bc more readily under'- stood by reference to the accompanying drawings, forming a: part of this specification end in which;

Figure l is e perspective view of t grob bucket embodying'my invention; Fig. 2 is c vertical section on the irregular line -x of Fig.v 3; Fig. 3 is o side elevation of the bucket; Fig. 4 is s plan view of the bucket, portions of the side pistes being broken sway to fully disclose the closing mechanism; Fig. 5 is a. sectional detail on the line y-Jy of Fig. 3; and Fig. 6 is o. sectional detail on the iine c-z of Fig. 2.

My improved grebbucket is particularly The opening.

intended and. adapted for handling coal, ore and other heavy bulk materiels. It usually comprises. two scoops or bucket portions,

which are adopted tof form. a. singlereceptawci'e when. their lower or cutting edges sie brought together. A differentist winding mechanism, usueliy referred to es the closing mechanism, is orrcngedbetween the scoops. mechenism or mechanisms comprise powerful toggle levers whichere errenged on; thesides of the scoops. ccbies are used for operating the bucket, et. leest one being employed in connection with Severeli the closing mechanism and. at ieest one for opening; the bucket. At times, when the bucket is held suspended by the cables, itv

may be opened by drawing up on the opening csbie or. cables onbyv sleckemng the closing cable. Wheny this is done the Weightofthe bucket plus the weight of the lood' therein, ifeny, is exerted upon the scoops through the powerful leverage of the toggles, and thev sooo s ere forced open. In this conditionthe ucket is dro ped upon the meteriei to be excavated endioisted and the closing ceF bie is then drawn tout end operates upon the closing mechanism to forcibly draw or close the scoops together and inclose the lood of materiali. .The scoops are constructed in such manner es to have ewide spread end c decided tendency to dig into the material when being closed thereon. After the bucket is cios'ed, it is raised and moved to the point where the load is to'be dumped. During the transit ot' the bucket its weight is supported'V by the closing cable, assisted by the opening cables, which lutter moy also bedrewn tout; as et such times, the bucket is held shut by the tension of the closing cable on the ciosing mechanism. point the closing cable is slsckenedor allowedv to run free or the opening cables are wound on the hoisting drum. Either action places the weight on the opening cables whic i, op.- ereting through the opening mechanism, cause the opening of the scoops.

In handling heavy, sticky material, such es clcy end some kinds of ore, itis often diih- .cult to dislodge the material und the same,

lpowerful opening mechanism, before re- On reaching the dumping mechanism here illustrated are substantially identical lwith the corresponding members shown in the patent before referred to. l

Referring now tothe drawings for the details of construction, it will be seen that the grab bucket comprises three principal members,namely the frame, A, and the two halves or scoops, B-B. The frame A comprises the triangular vertical members, lzcn two pivot shafts, aa, connecting the tops of the members, aha', and a third shaft which supports the differential-winding drinn, C. Each scoop, B, is a rigid'structure, comprising the side plates, 5 1), the back plate, b, a cross bar, b, and a scoop or shovel. section, lim.. The upper ends of the scoops are rigidly attached to the ends of respective shafts,

a-d, and are thereby iivoted to the frame. The scoops are preferab y joined by an equalizer in the form of gear segments, d, fastened on the shafts, a/-a/Q and intermeshing as shown in Figs. l and 4. The winding drum comprises a large drum, C, for the main hoisting and closing cable, E, together with two small drums, C-C,-for the shoit, closing cables or chains, C. The main cable, E, is wrap )ed upon the drum, C, and has-its end attaclied thereto. Thev short cables, C, are attached to the small drums and their outer ends are secured in respective cross bars, b, near the lower ends of the scoops.

The winding mechanism. is ofthe dill'erential order and its arrangement and manner of operation are well shown. by dotted lines in Fig. e represents a centi-ally located guide for the closing cable, E, said guide being supported by the parallel shafts, a-a. As a guard for the winding drum and as a means to prevent the cable, E, from dropping away from the drum, C, I employ a pendent guard, shown in Figs. 2, 4 and 6. This' guard comprises the end sections, e,.e, and several cross bars, d, wlii-cl'i connect them at oints below the drum, C. The bars e form a grating which prevents the gathering of material-in the'space between the guard andthe drum, permitting the` same to dro away when the bucket is opened. This guard is journaled loosely on the small drum, (l, and may therefore swing beneath the drum. I preferably employ two opening mechanisms, each comprising a toggle lever,- F, one

l on each side of vthe bucket. At points relatively below and outside of the shafts, (M -ct', I provide the sides of the scoops with pivots,

j"-". The toggle lever sections, ,f2-f2,

have their ends secured by res ective pivots, The middle pivot, f3, w ich joins the "5 sections, f2, serves also as the means for the attachment of a stirrup, f4, at the knee of the lever. To this stirrup I attach the lower end of the opening cable, G,

g 'represents an anti-friction guide provided on the side of'the frame, A, for the vopening cable, G. 4

As before stated, I ein loy two of the toggle levers, one on. each si e of the bucket and the guides and cables, G, are therefore duplicated, as clearlyshown in Figs. l, 2 and 4.

As a means of assisting the equalizingv action of the segmental gears, d, I prefer to use the parallel guides, H, onthe sides of frame, A. The inner sides of the stirrups work between these vertical guides, as `best shown in Fig. 5, and the kneesof the toggle levers being thus vheld against movement, except on vertical lines, the desired relations are maintained between the scoops, B-B, and the frame, A. The lifting or the closing of one scoopin advance. of the other is thus prevented. While the best practice may dictate the employment of both the segmentalgears and the vertical guides, H, they may bensed separately, without departing from the scope of my invention.

In carrying out my invention I prefer to use the widely separated pivots, aa, for the scoops, but under special conditions and for certain uses, both scoops may be attached to a single center or pivot. requirements I may join the two opening cables in onev at a point above the bucket.

To meet special pulling on the opening cables, G. This throws the weight upon vthe o ening cables and leaves the bucketsuspen ed` therefrom through the medium of the toggle'levers.

The weight of the bucket or of the bucket and its load causes the same to fall 'between the ends of the toggle levers as illustrated by the dotted lines in Fig. 3, and obviously the toggle levers, which act upon intermediate points 'on the scoops, serve as fiilcrums whereon the scoops pivot thus the scoops are thrown open. A particular advantage of my invention resides in the fact that the bucket is of low height and has no rejecting arts that are likely to be struck during use in the holds of ships.' In this connection, I

plates, b, of my bucket extend upwardly and are inclined toward the closingcable', aiford- -dircct attention to the fact that the back ing an inclined top, which if it strikes adeck beam glances off without damaging it.

As various modifications of my.invention will readily suggest themselves to one skilled 'in the art, I do not confine the invention to the specific structure herein shown and dr scribed.

Having thus described my invention, l claim as new and desire to secure by Letters Patent: y

l. A grab bucket cinnprising pivotally joined scoops and a frame, in combination with a closing mechanism arranged upon said frame beneath the pivoted ends of said scoops, a toggle lever pivotally interposed. between said scoops, a closing cable connected with said closing mechanism, and an opening cable connected with the knee oi said toggle lever, substantially as described.

2. A grab bucket comprising a frame, in combination with scoops pivoted thereon, a mechanism carried by said frame for closing said scoops, a toggle lever having its ends attached to respective scoops and a stirrup at the knee of said lever, substantially as described.

3. A grab bucket comprising a frame, in combination with scoops pivoted thereon, a closing mechanism carried by said frame, toggle levers having their ends attached to respective scoops, a closing cable connected to said closing mechanism and opening cables connected to respective toggle levers, substantially as described.

4. A grab bucket comprising a frame, in combination with scoops pivoted thereon, a closing mechanism carried by said frame, toggle levers having their ends attached to respective scoops, means for equalizing the movements of said scoops, a closing cable connected to said closing mechanism and opening cables connected to respective toggle levers, substantially as described.

5. A grab bucket comprising a frame, in combination with scoops pivoted thereon, a closing mechanism carried by said frame, and an opening mechanism composed of toggle levers having their ends pivoted to respective scoops and having their knees guided by said frame, substantially as described.

6. A (fra-b bucket com arising a 'frei-ne in` D t: I

.combination With scoops pivoted or4 said frame., a closing mechanism, toggle levers interposed'between the scoops and having stirrups at their knees, and stirrup guides on said frame, substantially' described.

'7. A grab bucket comprising a frame, in combination with tw'o rigid scoops, shai'ts having bearings in said trame and Wliereon res"ectivc scoops are lixed, an equalizer n nich operatively connects said shafts, a closing mechanism, toggle levers having their ends intermediatelJ pivoted upon respective scoops, cable stirrups for said toggles and stirrup guides on said frame, subv stantially as described.

8. A grab bucket comprising a frame, in combination with a differential Winding mechanism thereon, scoops pivoted on said traine above said mechanism and adapted to close beneath saidmechanism,-a toggle lever or levers interposed between said scoops, beneath the pivots thereof, cable stirrups thereon and suitable equalizing means, sub-- stanlially described..

. 9. A grab bucket comprising a frame, in combination with tivo rigid scoops having their upper ends pivoted to said frame, the end or back plates of said scoops being in- -clined at the top, a closing mechanism on the frame between said scoops and opening devices on the sides of said scoops, substan tially as described..

10. A grab bucket comprising pivotally connected scoops, in combination with a closing mechanism, a cable connected to said mechanism and occupying a central position in the bucket, toggle leve having their ends pivoted to the sides of respective scoops and opening cables connected. to said toggle levers at the sides of the bucket, substantially as described.

l1. A grab bucket comprising combination with scoops pivoted thereon, a closing mechanism carried by said frame, a closing or hoisting cable attached 'to said closing mechanism and occupying the vertical aXis of the bucket, toggle lever opening mechanisms, and an opening cable or cables attachedv to said toggle mechanisms at the sides of' the bucket, substantially as described.

. 12. A grab bucket comprising a frame, in combination with scoops pivoted thereon, a closing mechanism carried by said frame,` a. closing or hoisting cable attached ,to said closing mechanism and occupying the vertical axis of the bucket, togglelever opening mechanisms, an opening cable or.cables attached to said toggle lever mechanisms at' the sides of the bucket, and suitable means for equalizing the movement of said scoops, substantially as described.

13. A grab bucket comprising a frame, in combination with 'scoops pivoted thereon, a closing mechanism arranged in said frame beneath the pivots of the scoops, said closing mechanism comprising a differential winding drum and cables or chains extending from the smaller portions thereof to fasten ings upon the scoops near the lower ends thereof, a closing cable Wound upon -the 'larger part of said drum, and means Jfor opening said scoops, said means including an opening cable or cables, substantially as described.

14. A grab bucket comprising a frame, in

combination with scoops pivoted thereon, a

differential Winding drum arranged on said frame beneath the pivots of said scoops, a pendent guard or grating arranged beneath a frame, in

said drum, and suitableopening mechanism,

substantially as described. `15. Agrab bucket comprising a frame, in

combination with scoops pivoted thereon, an equalizer which operatively connects seid scoops, closing ineens for said scoops, and a toggle lever or levers interposedv between the scoops adapted to openthe same, substentially as described. f

16. A grab bucket comprising pivotally connected scoops, in combination with means for closing the scoops, toggle levers 10 having their ends' pivoted to the sides of p respective scoops, end opening cables connected to said-toggle levers at the sides of the bucket, substantially as described.

In testimony whereof, I have hereunto' set my hand7 this 12th day of October, 1907, in 15 the presence of two subscribing witnesses.

HERMAN P. ANDRESEN- Witnesses:

' CHARLES GILBERT HAWLEY,

M. SIMON. 

